var getCookie = function(c_name) {
  if (document.cookie.length>0) {
    c_start = document.cookie.indexOf(c_name + "=");
    if (c_start != -1) {
      c_start = c_start + c_name.length + 1;
      c_end = document.cookie.indexOf(";", c_start);
      if (c_end == -1) c_end = document.cookie.length;
      return unescape( document.cookie.substring(c_start, c_end) );
    }
  }
  return "";
};

var setCookie = function(c_name,value,expiredays) {
  var exdate = new Date();
  exdate.setDate( exdate.getDate() + expiredays );
  document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires=" + exdate.toGMTString());
  document.write("Hello");//window.location.href="student.php";
};

var checkCookie = function() {
  var username = getCookie('username');
  if (username != null && username != "") {
    alert('Welcome again ' + username + '!');
  } else {
    username = prompt('Please enter your name:', "");
    window.location.href = "login.html";
  }
};

var exdate=new Date();
exdate.setDate( exdate.getDate() + 1 );
